package com.demo1;

public class Test {
    public static void main(String[] args) {
        Person person = new Person("zhangsan", 20);
        System.out.println(person.say());

        System.out.println("===========");
        Student student = new Student("zhangsanfeng", 20, "123456", 90);
        student.setAge(21);
        System.out.println(student.say());
    }
}
